<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Tab栏案例优化</title>
</head>

<head lang="en">
    <meta charset="UTF-8" />
    <title></title>
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
        }

        ul {
            list-style: none;
        }

        .wrapper {
            width: 1000px;
            height: 475px;
            margin: 0 auto;
            margin-top: 100px;
        }

        .tab {
            border: 1px solid #ddd;
            border-bottom: 0;
            height: 36px;
            width: 320px;
        }

        .tab li {
            position: relative;
            float: left;
            width: 80px;
            height: 34px;
            line-height: 34px;
            text-align: center;
            cursor: pointer;
            border-top: 4px solid #fff;
        }

        .tab span {
            position: absolute;
            right: 0;
            top: 10px;
            background: #ddd;
            width: 1px;
            height: 14px;
            overflow: hidden;
        }

        .products {
            width: 1002px;
            border: 1px solid #ddd;
            height: 476px;
        }

        .products .main {
            float: left;
            display: none;
        }

        .products .main.active {
            display: block;
        }

        .tab li.active {
            border-color: red;
            border-bottom: 0;
        }
    </style>
</head>

<body>
    <div class="wrapper">
        <ul class="tab">
            <li class="tab-item active" data-id="0">国际大牌<span>◆</span></li>
            <li class="tab-item" data-id="1">国妆名牌<span>◆</span></li>
            <li class="tab-item" data-id="2">清洁用品<span>◆</span></li>
            <li class="tab-item" data-id="3">男士精品</li>
        </ul>
        <div class="products">
            <div class="main active">
                <a href="###"><img src="../images/guojidapai.jpg" alt="" /></a>
            </div>
            <div class="main">
                <a href="###"><img src="../images/guozhuangmingpin.jpg" alt="" /></a>
            </div>
            <div class="main">
                <a href="###"><img src="../images/qingjieyongpin.jpg" alt="" /></a>
            </div>
            <div class="main">
                <a href="###"><img src="../images/nanshijingpin.jpg" alt="" /></a>
            </div>
        </div>
    </div>

    <script>
        // 获取标签
        /* const ul = document.querySelector('ul');
        const main = document.querySelectorAll('.main');
        // 注册绑定委托事件
        ul.addEventListener('click', function (e) {
          if (e.target.classList.contains('tab-item')) {
            document.querySelector('.tab .active').classList.remove('active');
            e.target.classList.add('active');
            const index = e.target.dataset.id;
            document.querySelector('.products .active').classList.remove('active');
            main[index].classList.add('active');
          };
        }); */


        // tab栏切换案例使用数组forEach优化
        const lilist = document.querySelectorAll('li');
        lilist.forEach((value, index) => {
            value.addEventListener('click', () => {
                document.querySelector('li.active').classList.remove('active');
                value.classList.add('active');
                document.querySelector('.products .active').classList.remove('active');
                document.querySelectorAll('.main')[index].classList.add('active');
            });
        });
    </script>


</body>

</html>